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   RE: DOM - Creating Documents

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  • From: Miles Sabin <msabin@cromwellmedia.co.uk>
  • To: 'Leigh Dodds' <ldodds@ingenta.com>
  • Date: Wed, 21 Apr 1999 12:55:09 +0100

Leigh Dodds wrote,
> Miles Sabin wrote,
> > The problem is that, in the abscence of the whole
> > CORBA infrastructure, there's no way getting hold of 
> > a concrete instance of a CORBA interface (unless 
> > you've already got one that defines a factory method 
> > ... but then we're on the first step of an infinite 
> > regress).
> Erm, so you're saying that 
> interface Document : Node {
>	Document	createDocument{} raises {DOMException}
> }
> isn't valid CORBA syntax and so thats why its not been 
> included?

No, that's perfectly valid CORBA IDL. But, now tell me
how you get hold of a concrete instance of Document so 
you can call that factory method? If you've already got
one, then you've already solved the problem. If you
haven't then Document.createDocument() only defers the
problem by one step.

Without CORBAs object lifecycle service there's no way
of having the equivalent of,

  interface Document : Node
    Document(); // constructor ... not valid IDL

    // etc.

We could have a DocumentFactory interface that looked
like this,

  interface DocumentFactory
     Document createDocument();

But then how do we get hold of a concrete instance of 
this factory interface so that we can call the method?
We can't.



Miles Sabin                          Cromwell Media
Internet Systems Architect           5/6 Glenthorne Mews
+44 (0)181 410 2230                  London, W6 0LJ
msabin@cromwellmedia.co.uk           England

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